Harman PB105, Heatilator BH105 Boiler Outdoor Air Extension TCP, 3-20-72181, OEM
Genuine OEM Harman and Heatilator Eco-Choice outdoor air extension TCP, part number 3-20-72181. This will be correct for the Harman PB105 pellet boiler, and the Heatilator Eco-Choice BH105 pellet boiler models.